[Samba] why username for winbind authentication

[Ingmar Koecher]

This is more a theoretical question, but why is it necessary to provide a 
username & password for non-anonymous winbindd connections?

Why isn't it possible to use the account & password of the computer account?

Isn't that what enables a WinNT/Win2k client to resolve SID's to names when I 
am in the local user manager for example?

Just curious,
Ingmar.